Answered: A study conducted in 2012 found that…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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A study conducted in 2012 found that the length of Atlantic cod caught in nets in Karlskrona, Sweden is normally distributed with mean 52 cm and standard deviation 3.7 cm.

1. What is the probability that a single randomly caught Atlantic cod is between 59.4 and 55.7 cm? (Use the 68-95-99.7 Rule instead of a table or exact value).

2. What is the probability that a random sample of 49 Atlantic cod have an average length between 53.06 and 51.47 cm? (Use the 68-95-99.7 Rule instead of a table or exact value).

3. What do you notice about the above probabilities? The range (55.7, 59.4) is wider than (51.47, 53.06). What does this tell you about the shape of the distribution of individual lengths (from part (a)) compared to the distribution of sample average lengths (from part (b))?

Definition Definition Measure of central tendency that is the average of a given data set. The mean value is evaluated as the quotient of the sum of all observations by the sample size. The mean, in contrast to a median, is affected by extreme values. Very large or very small values can distract the mean from the center of the data. Arithmetic mean: The most common type of mean is the arithmetic mean. It is evaluated using the formula: μ = 1 N ∑ i = 1 N x i Other types of means are the geometric mean, logarithmic mean, and harmonic mean. Geometric mean: The nth root of the product of n observations from a data set is defined as the geometric mean of the set: G = x 1 x 2 ... x n n Logarithmic mean: The difference of the natural logarithms of the two numbers, divided by the difference between the numbers is the logarithmic mean of the two numbers. The logarithmic mean is used particularly in heat transfer and mass transfer. ln x 2 − ln x 1 x 2 − x 1 Harmonic mean: The inverse of the arithmetic mean of the inverses of all the numbers in a data set is the harmonic mean of the data. 1 1 x 1 + 1 x 2 + ...

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